Ultimate study guide for questions about our solar system, whether a student, lover of all things space, or stargazing and night sky enthusiast. Beautifully designed with images from NASA and expertly written by science author, consultant and professor John Roch, PhD. This guide will last a lifetime so you will always know what the surface temperature of Mercury is, how many known satellites Neptune has, what the Kuiper Belt is, or what other dwarf planets there are besides Pluto.